Biol 2101 Lab Final

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Fascicle(2)

surrounded by perimysium

Sarcoplasmic reticulum

tubular network wrapped around each myofibril

Endomysium(2)

Encases individual muscle fibers

Perimysium(1)

Fibrous connective tissue rich in collagen and elastin

Aponeurosis

If tendon is a broad sheet

Epimysium(2)

Rich in collagen fibers

Contains only thick filaments

A band contains only

Fascicle(1)

A bundle of muscle fibers within a muscle

Cardiac muscle cells

Branched fibers

Depolarized

Ca2+ released into muscle fiber when

Muscle contraction

Ca2+ released triggers

Transverse tubule

Carries wave of depolarization throughout muscle fiber

Thin myofilament

composed primarily of actin

I band

Z disc is in middle of

Muscle fiber(1)

a single multinucleate muscle cell

neuromuscular junction

point of contact between a motor neuron and a skeletal muscle cell

Axon of motor neuron

carries wave of depolarization to muscle

Sarcomere

functional subunit of myofibril

Synaptic vesicles

fuse with plasma membrane of axon terminal to release ACh into synaptic cleft

Tendon(3)

heavy in collagen fibers

Epimysium(3)

Surrounds entire muscle

Thick myofilament

composed primarily of myosin

M line

connects thick filaments down center of sarcomere

Endomysium(4)

connects together adjacent muscle fibers within the fascicle

sarcoplasmic reticulum

contains high Ca2+ concentration

motor end plate

contains membrane receptor proteins that bind acetylcholine

Synaptic cleft

contains molecules of the enzyme actylcholinesterse (AChE)

H zone

contains only thick filaments

thick and thin myofilaments

creates banded pattern within sarcomere

Myofibril

cylindrical subunit of muscle fiber

Perimysium(2)

divides muscle into compartments called fascicles

Z disc

end line of a sarcomere

Sarcomere

extends from Z disc to Z disc

motor end plate

forms muscle side of neuromuscular junction

Transverse tubule

forms network through muscle fiber

Axon terminal

forms neuron side of neuromuscular junction

I band

light region at each end of sarcomere

H zone

lighter region around M line

Synaptic vesicles

located at tip of axon terminal

Synaptic cleft

narrow space between axon terminal and motor end plate

Sarcolemma

plasma membrane of a muscle fiber

NA+ rushes into muscle fibers, which may depolarize the sarcolemma

when ACh is bound to receptors,

Contains only thin filaments

I band contains only

Sarcomere

I band, A band, H zone, M line, Z disc

Tendon(1)

Rope-like bundle of dense regular connective tissue

Smooth muscle cells

Single, nucleated cells

Synaptic cleft

AChE breaks down ACh to remove it from the

Myofibril

Consists of series of sarcomeres

Synaptic vesicles

Contain neurotransmitter, acetylcholine (ACh)

Endomysium(3)

Contains capillaries and neurons associated with its muscle fiber

Transverse tubule

Continuous with sarcolemma

Axon Terminal

distal portion of a motor neuron

Myofibril

Appears banded under microscope due to arrangement of myofilaments

Tendon (4)

Attaches muscle to bone

Epimysium(1)

Dense layer of connective tissue

Perimysium

Layer surrounding fascicle (bundle of fibers)

Endomysium

Layer surrounding individual muscle fibers

Skeletal muscle cells

Linearly arranged sarcomeres

Tendon(2)

Located at the ends of muscle

Perimysium(3)

Nerves and blood vessels run through muscle in this layer of connective tissue

Epimysium

Outermost layer- merges with tendon/aponeurosis

Sarcomere

Overlapping thin and thick filaments slide past each other to produce contraction

Z disc

Thin filaments anchored to it

Skeletal muscle cells

Unbranched fibers

Skeletal muscle cells

Voluntary

Muscle fiber(2)

Wrapped in endomysium

Axon of motor neuron

branch of efferent motor neuron

Endomysium(1)

delicate connective tissue layer

A band

dense central region of sarcomere

Mitchondria

produce ATP to power muscle contraction


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